Hi,
I have an upper filter to volume devices and I need to maintain a DRL of
writes that come into the device. I have a fixed sized map for doing
this.
I would like to persist this map so that I can track it across boots.
Options are registry or a file. If I persist in registry, what is the
kind of performance hit that I am looking at? And how would it compare
to storing it in a file.
I understand that a lot depends on the policy of how frequently I store
the map in registry|file. But lets take the extreme case that I store
map to registry for every write to a new region for which I find that
bit was previously clear and is now being set. What kind of impact will
the writes have if I do this.
Other extreme would be to store it when I see a shutdown notitification
(IRP_MJ_SHUTDOWN) but this is not safe enough because OS might crash and
I will loose all the DRL information.
Thanks
Harish
If art interprets our dreams, the computer executes them in the guise of
programs!